In order to survive the battle, equip a strong healing medal such as Minnie or Daisy, as well as several strong Speed Medals. Two or three copies of Defense Boost I should also be equipped.

In order to complete the objective, you will need your deck to begin with KH CoM Naminé to copy Ava's buffs, Alice to remove them, then strong Speed Medals to deal damage. You will still need a healing Medal.